Electrochemical detection and characterization of caffeine in selected tea samples using polyglycine modified Carbon paste electrode
Glycine was electro-polymerized against a carbon paste electrode (CPE) to produce a polymer film via the electro-oxidation process comprising amino (-NH2) and carboxylic (-COOH) groups, by a cyclic voltammetric. The electrochemical oxidation of caffeine was examined in 0.2 M phosphate buffer solutio...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-01-01
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| Series: | South African Journal of Chemical Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1026918524001392 |
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| author | Dereje Yenealem Fetene Michu Santhi Raju Pilli Dessie Tibebe |
| author_facet | Dereje Yenealem Fetene Michu Santhi Raju Pilli Dessie Tibebe |
| author_sort | Dereje Yenealem |
| collection | DOAJ |
| description | Glycine was electro-polymerized against a carbon paste electrode (CPE) to produce a polymer film via the electro-oxidation process comprising amino (-NH2) and carboxylic (-COOH) groups, by a cyclic voltammetric. The electrochemical oxidation of caffeine was examined in 0.2 M phosphate buffer solution (PBS). The Polyglycine modified Carbon Paste Electrode (PGMCPE) demonstrates greater electrocatalytic activity for caffeine as compared to the unmodified CPE (UNMCPE). This made it suitable for analyzing caffeine owing to its increased electrode surface area and/or improved electron transport at the electrode surface. By varying the concentration range from 0.05 to 0.9 mM, the relationship between peak current and caffeine concentration was studied and this produced a correlation coefficient of R2 = 0.9987. This method was extremely capable of evaluating caffeine concentrations. Square wave voltammetry (SWV) was utilized to assess the caffeine in tea samples. The sample was analyzed with square wave voltammetry and was made easier with an ideal pH of 12.0. Additionally, the caffeine levels in a tea sample were successfully measured using the linear range and detection limit, and the results showed a good limit of detection (LOD) in comparison to previous literature. |
| format | Article |
| id | doaj-art-54d9badf823444c6bdfd2fe23757d49c |
| institution | Kabale University |
| issn | 1026-9185 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | South African Journal of Chemical Engineering |
| spelling | doaj-art-54d9badf823444c6bdfd2fe23757d49c2025-01-19T06:24:19ZengElsevierSouth African Journal of Chemical Engineering1026-91852025-01-0151225231Electrochemical detection and characterization of caffeine in selected tea samples using polyglycine modified Carbon paste electrodeDereje Yenealem0Fetene Michu1Santhi Raju Pilli2Dessie Tibebe3Department of Chemistry, College of Natural and Computational Sciences, University of Gondar, P.O. Box 196 Gondar, EthiopiaDepartment of Chemistry, College of Natural and Computational Sciences, University of Gondar, P.O. Box 196 Gondar, EthiopiaDepartment of Chemical Engineering Technology, College of Applied Industrial Technology (CAIT), Jazan University, Jazan 45971, Kingdom of Saudi ArabiaCorresponding author.; Department of Chemistry, College of Natural and Computational Sciences, University of Gondar, P.O. Box 196 Gondar, EthiopiaGlycine was electro-polymerized against a carbon paste electrode (CPE) to produce a polymer film via the electro-oxidation process comprising amino (-NH2) and carboxylic (-COOH) groups, by a cyclic voltammetric. The electrochemical oxidation of caffeine was examined in 0.2 M phosphate buffer solution (PBS). The Polyglycine modified Carbon Paste Electrode (PGMCPE) demonstrates greater electrocatalytic activity for caffeine as compared to the unmodified CPE (UNMCPE). This made it suitable for analyzing caffeine owing to its increased electrode surface area and/or improved electron transport at the electrode surface. By varying the concentration range from 0.05 to 0.9 mM, the relationship between peak current and caffeine concentration was studied and this produced a correlation coefficient of R2 = 0.9987. This method was extremely capable of evaluating caffeine concentrations. Square wave voltammetry (SWV) was utilized to assess the caffeine in tea samples. The sample was analyzed with square wave voltammetry and was made easier with an ideal pH of 12.0. Additionally, the caffeine levels in a tea sample were successfully measured using the linear range and detection limit, and the results showed a good limit of detection (LOD) in comparison to previous literature.http://www.sciencedirect.com/science/article/pii/S1026918524001392TeaCaffeineCarbon paste electrodePolyglycine carbon paste electrode |
| spellingShingle | Dereje Yenealem Fetene Michu Santhi Raju Pilli Dessie Tibebe Electrochemical detection and characterization of caffeine in selected tea samples using polyglycine modified Carbon paste electrode South African Journal of Chemical Engineering Tea Caffeine Carbon paste electrode Polyglycine carbon paste electrode |
| title | Electrochemical detection and characterization of caffeine in selected tea samples using polyglycine modified Carbon paste electrode |
| title_full | Electrochemical detection and characterization of caffeine in selected tea samples using polyglycine modified Carbon paste electrode |
| title_fullStr | Electrochemical detection and characterization of caffeine in selected tea samples using polyglycine modified Carbon paste electrode |
| title_full_unstemmed | Electrochemical detection and characterization of caffeine in selected tea samples using polyglycine modified Carbon paste electrode |
| title_short | Electrochemical detection and characterization of caffeine in selected tea samples using polyglycine modified Carbon paste electrode |
| title_sort | electrochemical detection and characterization of caffeine in selected tea samples using polyglycine modified carbon paste electrode |
| topic | Tea Caffeine Carbon paste electrode Polyglycine carbon paste electrode |
| url | http://www.sciencedirect.com/science/article/pii/S1026918524001392 |
| work_keys_str_mv | AT derejeyenealem electrochemicaldetectionandcharacterizationofcaffeineinselectedteasamplesusingpolyglycinemodifiedcarbonpasteelectrode AT fetenemichu electrochemicaldetectionandcharacterizationofcaffeineinselectedteasamplesusingpolyglycinemodifiedcarbonpasteelectrode AT santhirajupilli electrochemicaldetectionandcharacterizationofcaffeineinselectedteasamplesusingpolyglycinemodifiedcarbonpasteelectrode AT dessietibebe electrochemicaldetectionandcharacterizationofcaffeineinselectedteasamplesusingpolyglycinemodifiedcarbonpasteelectrode |